| 云岗盆地晚中生代沉积-火山充填序列及其构造意义 |
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| 引用本文： | 李振宏,渠洪杰,杨永恒,公王斌.云岗盆地晚中生代沉积-火山充填序列及其构造意义[J].中国地质,2016(5):1481-1494. |
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| 作者姓名： | 李振宏 渠洪杰 杨永恒 公王斌 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081,中国地质科学院地质力学研究所, 北京 100081,中油辽河油田分公司, 辽宁 盘锦 124010,中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 国家自然科学基金项目（41372122）及中国地质调查局地质调查项目（1212011121095）联合资助。 |
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| 摘 要： | 利用凝灰岩夹层及安山岩的锆石U-Pb同位素测年,对云岗盆地晚中生代地层充填序列的关键时限进行了限定。结合地层接触关系、安山岩的地球化学特征,分析了重点地质界面的构造意义。取得了以下主要认识:(1)早中侏罗世,盆地为一套湖进序列的连续沉积,以大同组含煤地层为代表,暗示着区域拉张的构造背景;(2)盆地整体缺失了晚侏罗世(160.4±1.1)Ma至早白垩世(130.1±0.7)Ma的沉积地层,其发生的动力学背景可能与古太平洋、西伯利亚、特提斯同时向东亚大陆汇聚产生的远程效应有关;(3)旧高山安山岩形成于早白垩世(130.1±0.7)Ma大陆板内裂谷的构造背景,与华北克拉通破坏的动力学背景紧密相关。研究成果对旧高山安山岩时代归属提出了新的认识,并不归属于上侏罗统髫髻山组,而相当于下白垩统张家口组。
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| 关 键 词： | 云岗盆地 旧高山 晚中生代 凝灰质碳酸盐岩 安山岩 锆石U-Pb同位素测年 |
| 收稿时间： | 2015/10/26 0:00:00 |
| 修稿时间： | 2016/3/18 0:00:00 |
Late Mesozoic sedimentary-volcanic filling record in Yungang basin and its tectonic implications |
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| LI Zhen-hong,QU Hong-jie,YANG Yong-heng and GONG Wang-bin.Late Mesozoic sedimentary-volcanic filling record in Yungang basin and its tectonic implications[J].Chinese Geology,2016(5):1481-1494. |
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| Authors: | LI Zhen-hong QU Hong-jie YANG Yong-heng and GONG Wang-bin |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,Liaohe Oilfield Company of Petrochina, Panjin 124010, Liaoning, China and Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | Based on regional stratigraphic correlation and using zircon dating method of tuff layer and andesite rocks in the Late Mesozoic stratigraphic sequence, the authors defined the key time of the sedimentary-fill record. According to the formation contact relationship and the geochemical characteristics of the andesite, the authors also analyzed the tectonic significance of the key geological interface. Some conclusions have been reached:(1) During the Early-Middle Jurassic, the sedimentary sequence was characterized by a suite of lake transgression sequence with the coal-bearing strata of Datong Formation, indicating the tectonic setting of the regional extension; (2) These strata had no sedimentary record from Late Jurassic (160.4±1.1 Ma) to Early Cretaceous (130.1±0.7 Ma), which was dynamically associated with far field effects produced by synchronous convergences toward the east Asia continent of different plates (Siberia, Paleo-Pacific, Tethys); (3) The andesite of Jiugaoshan was developed in the tectonic setting of the continental rift during the Early Cretaceous, which might have been associated with the destruction of the North China Craton. The andesite age of Jiugaoshan was defined in the study. It does not belong to the Tiaojiashan Formation, but corresponds to the Zhangjiakou Formation in Yanshan area. |
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| Keywords: | Yungang basin Jiugaoshan Late Mesozoic tuffaceous carbonate andesite zircon U-Pb isotopic age |
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